Low-Temperature Dehydration
of Gypsum Single Crystals

R. A. Khasanov^a, N. M. Nizamutdinov^a, N. M. Khasanova^a,
A. T. Gubadullin^b, and V. M. Vinokurov^a

^a Kazan State University, ul. Kremlevskaya 18, Kazan, 420008 Russia

e-mail: Vladimir.Vinokurov@ksu.ru

^b Institute of Organic and Physical Chemistry, Kazan Research Center, Russian Academy of Sciences, Kazan, Russia

e-mail: aidar@iopc.knc.ru

Received August 2, 2007

Abstract—On the basis of the analysis of the electron spin resonance spectrum of the radical ion, it is
established that the transformation of gypsum (CaSO₄ · 2H₂O) into bassanite (CaSO₄ · 0.5H₂O) with partial
removal of water molecules occurs through the formation of an anhydrous metastable phase. This phenomenon,
reflecting the processes of recrystallization of materials of this class, serves as the scientific basis for the pro-
duction of binders from sulfate mineral associations.

PACS numbers: 61.50.ks, 64.70.kb, 76.30.Rn

DOI: 10.1134/S1063774508050143

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